KINE 2049 Chapter Notes - Chapter 9: Internal Validity, Treatment And Control Groups, Latin Square
13 Nov 2018
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Internal validity: being able to justify that x actually caused y: external validity: applying the conclusions of a scientific study outside the context of that study. Treatment and control groups: treatment may be considered successful if subjects rate more favourably on outcome variable than control group subjects, multiple levels of experimental stimulus may be administered, meaning there may be more than one treatment group. If students remember their answers from the pre-test evaluation, they may tend to repeat them in the post test exam. Results will be inflated by the high performing students: regression threat: refers to the statisti(cid:272)al te(cid:374)de(cid:374)(cid:272)(cid:455) of a g(cid:396)oup(cid:859)s o(cid:448)e(cid:396)all pe(cid:396)fo(cid:396)(cid:373)a(cid:374)(cid:272)e o(cid:374) a measure during a post-test to regress towards mean of that measure rather than anticipated direction. Controls maturation, testing, regression, selection and pre test post test interaction. So examine main effect and interaction effects: most basic: 2 x 2, consists of two treatments each with two levels, example:
